builtin/init-db.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "builtin.h"
   7 #include "abspath.h"
   8 #include "environment.h"
   9 #include "gettext.h"
  10 #include "object-file.h"
  11 #include "parse-options.h"
  12 #include "path.h"
  13 #include "refs.h"
  14 #include "repository.h"
  15 #include "setup.h"
  16 #include "strbuf.h"
  17
  18 static int guess_repository_type(const char *git_dir)
  19 {
  20         const char *slash;
  21         char *cwd;
  22         int cwd_is_git_dir;
  23
  24         /*
  25          * "GIT_DIR=. git init" is always bare.
  26          * "GIT_DIR=`pwd` git init" too.
  27          */
  28         if (!strcmp(".", git_dir))
  29                 return 1;
  30         cwd = xgetcwd();
  31         cwd_is_git_dir = !strcmp(git_dir, cwd);
  32         free(cwd);
  33         if (cwd_is_git_dir)
  34                 return 1;
  35         /*
  36          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
  37          */
  38         if (!strcmp(git_dir, ".git"))
  39                 return 0;
  40         slash = strrchr(git_dir, '/');
  41         if (slash && !strcmp(slash, "/.git"))
  42                 return 0;
  43
  44         /*
  45          * Otherwise it is often bare.  At this point
  46          * we are just guessing.
  47          */
  48         return 1;
  49 }
  50
  51 static int shared_callback(const struct option *opt, const char *arg, int unset)
  52 {
  53         BUG_ON_OPT_NEG(unset);
  54         *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
  55         return 0;
  56 }
  57
  58 static const char *const init_db_usage[] = {
  59         N_("git init [-q | --quiet] [--bare] [--template=<template-directory>]\n"
  60            "         [--separate-git-dir <git-dir>] [--object-format=<format>]\n"
  61            "         [--ref-format=<format>]\n"
  62            "         [-b <branch-name> | --initial-branch=<branch-name>]\n"
  63            "         [--shared[=<permissions>]] [<directory>]"),
  64         NULL
  65 };
  66
  67 /*
  68  * If you want to, you can share the DB area with any number of branches.
  69  * That has advantages: you can save space by sharing all the SHA1 objects.
  70  * On the other hand, it might just make lookup slower and messier. You
  71  * be the judge.  The default case is to have one DB per managed directory.
  72  */
  73 int cmd_init_db(int argc, const char **argv, const char *prefix)
  74 {
  75         const char *git_dir;
  76         const char *real_git_dir = NULL;
  77         const char *work_tree;
  78         const char *template_dir = NULL;
  79         unsigned int flags = 0;
  80         const char *object_format = NULL;
  81         const char *ref_format = NULL;
  82         const char *initial_branch = NULL;
  83         int hash_algo = GIT_HASH_UNKNOWN;
  84         enum ref_storage_format ref_storage_format = REF_STORAGE_FORMAT_UNKNOWN;
  85         int init_shared_repository = -1;
  86         const struct option init_db_options[] = {
  87                 OPT_STRING(0, "template", &template_dir, N_("template-directory"),
  88                                 N_("directory from which templates will be used")),
  89                 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
  90                                 N_("create a bare repository"), 1),
  91                 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
  92                         N_("permissions"),
  93                         N_("specify that the git repository is to be shared amongst several users"),
  94                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
  95                 OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
  96                 OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
  97                            N_("separate git dir from working tree")),
  98                 OPT_STRING('b', "initial-branch", &initial_branch, N_("name"),
  99                            N_("override the name of the initial branch")),
 100                 OPT_STRING(0, "object-format", &object_format, N_("hash"),
 101                            N_("specify the hash algorithm to use")),
 102                 OPT_STRING(0, "ref-format", &ref_format, N_("format"),
 103                            N_("specify the reference format to use")),
 104                 OPT_END()
 105         };
 106
 107         argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
 108
 109         if (real_git_dir && is_bare_repository_cfg == 1)
 110                 die(_("options '%s' and '%s' cannot be used together"), "--separate-git-dir", "--bare");
 111
 112         if (real_git_dir && !is_absolute_path(real_git_dir))
 113                 real_git_dir = real_pathdup(real_git_dir, 1);
 114
 115         if (template_dir && *template_dir && !is_absolute_path(template_dir)) {
 116                 template_dir = absolute_pathdup(template_dir);
 117                 UNLEAK(template_dir);
 118         }
 119
 120         if (argc == 1) {
 121                 int mkdir_tried = 0;
 122         retry:
 123                 if (chdir(argv[0]) < 0) {
 124                         if (!mkdir_tried) {
 125                                 int saved;
 126                                 /*
 127                                  * At this point we haven't read any configuration,
 128                                  * and we know shared_repository should always be 0;
 129                                  * but just in case we play safe.
 130                                  */
 131                                 saved = get_shared_repository();
 132                                 set_shared_repository(0);
 133                                 switch (safe_create_leading_directories_const(argv[0])) {
 134                                 case SCLD_OK:
 135                                 case SCLD_PERMS:
 136                                         break;
 137                                 case SCLD_EXISTS:
 138                                         errno = EEXIST;
 139                                         /* fallthru */
 140                                 default:
 141                                         die_errno(_("cannot mkdir %s"), argv[0]);
 142                                         break;
 143                                 }
 144                                 set_shared_repository(saved);
 145                                 if (mkdir(argv[0], 0777) < 0)
 146                                         die_errno(_("cannot mkdir %s"), argv[0]);
 147                                 mkdir_tried = 1;
 148                                 goto retry;
 149                         }
 150                         die_errno(_("cannot chdir to %s"), argv[0]);
 151                 }
 152         } else if (0 < argc) {
 153                 usage(init_db_usage[0]);
 154         }
 155         if (is_bare_repository_cfg == 1) {
 156                 char *cwd = xgetcwd();
 157                 setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
 158                 free(cwd);
 159         }
 160
 161         if (object_format) {
 162                 hash_algo = hash_algo_by_name(object_format);
 163                 if (hash_algo == GIT_HASH_UNKNOWN)
 164                         die(_("unknown hash algorithm '%s'"), object_format);
 165         }
 166
 167         if (ref_format) {
 168                 ref_storage_format = ref_storage_format_by_name(ref_format);
 169                 if (ref_storage_format == REF_STORAGE_FORMAT_UNKNOWN)
 170                         die(_("unknown ref storage format '%s'"), ref_format);
 171         }
 172
 173         if (init_shared_repository != -1)
 174                 set_shared_repository(init_shared_repository);
 175
 176         /*
 177          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
 178          * without --bare.  Catch the error early.
 179          */
 180         git_dir = xstrdup_or_null(getenv(GIT_DIR_ENVIRONMENT));
 181         work_tree = xstrdup_or_null(getenv(GIT_WORK_TREE_ENVIRONMENT));
 182         if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
 183                 die(_("%s (or --work-tree=<directory>) not allowed without "
 184                           "specifying %s (or --git-dir=<directory>)"),
 185                     GIT_WORK_TREE_ENVIRONMENT,
 186                     GIT_DIR_ENVIRONMENT);
 187
 188         /*
 189          * Set up the default .git directory contents
 190          */
 191         if (!git_dir)
 192                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 193
 194         /*
 195          * When --separate-git-dir is used inside a linked worktree, take
 196          * care to ensure that the common .git/ directory is relocated, not
 197          * the worktree-specific .git/worktrees/<id>/ directory.
 198          */
 199         if (real_git_dir) {
 200                 int err;
 201                 const char *p;
 202                 struct strbuf sb = STRBUF_INIT;
 203
 204                 p = read_gitfile_gently(git_dir, &err);
 205                 if (p && get_common_dir(&sb, p)) {
 206                         struct strbuf mainwt = STRBUF_INIT;
 207
 208                         strbuf_addbuf(&mainwt, &sb);
 209                         strbuf_strip_suffix(&mainwt, "/.git");
 210                         if (chdir(mainwt.buf) < 0)
 211                                 die_errno(_("cannot chdir to %s"), mainwt.buf);
 212                         strbuf_release(&mainwt);
 213                         git_dir = strbuf_detach(&sb, NULL);
 214                 }
 215                 strbuf_release(&sb);
 216         }
 217
 218         if (is_bare_repository_cfg < 0)
 219                 is_bare_repository_cfg = guess_repository_type(git_dir);
 220
 221         if (!is_bare_repository_cfg) {
 222                 const char *git_dir_parent = strrchr(git_dir, '/');
 223                 if (git_dir_parent) {
 224                         char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
 225                         git_work_tree_cfg = real_pathdup(rel, 1);
 226                         free(rel);
 227                 }
 228                 if (!git_work_tree_cfg)
 229                         git_work_tree_cfg = xgetcwd();
 230                 if (work_tree)
 231                         set_git_work_tree(work_tree);
 232                 else
 233                         set_git_work_tree(git_work_tree_cfg);
 234                 if (access(get_git_work_tree(), X_OK))
 235                         die_errno (_("Cannot access work tree '%s'"),
 236                                    get_git_work_tree());
 237         }
 238         else {
 239                 if (real_git_dir)
 240                         die(_("--separate-git-dir incompatible with bare repository"));
 241                 if (work_tree)
 242                         set_git_work_tree(work_tree);
 243         }
 244
 245         UNLEAK(real_git_dir);
 246         UNLEAK(git_dir);
 247         UNLEAK(work_tree);
 248
 249         flags |= INIT_DB_EXIST_OK;
 250         return init_db(git_dir, real_git_dir, template_dir, hash_algo,
 251                        ref_storage_format, initial_branch,
 252                        init_shared_repository, flags);
 253 }